# std::stack<T,Container>::size

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< cpp‎ | container‎ | stack

size_type size() const; |  |

Returns the number of elements in the container adaptor. Equivalent to: return`` `c`.size().

### Parameters

(none)

### Return value

The number of elements in the container adaptor.

### Complexity

Constant.

### Example

Run this code

    #include <cassert>
    #include <stack>

    int main()
    {
        std::stack<int> stack;
        assert(stack.size() == 0);

        const int count = 8;
        for (int i = 0; i != count; ++i)
            stack.push(i);
        assert(stack.size() == count);
    }

### See also

empty | checks whether the container adaptor is empty (public member function)
sizessize (C++17)(C++20) | returns the size of a container or array (function template)

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